The patch below does not apply to the 5.15-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.15.y git checkout FETCH_HEAD git cherry-pick -x f872d4af79fe8c71ae291ce8875b477e1669a6c7 # <resolve conflicts, build, test, etc.> git commit -s git send-email --to 'stable@vger.kernel.org' --in-reply-to '2024081146-whacking-skirt-ec12@gregkh' --subject-prefix 'PATCH 5.15.y' HEAD^..

Possible dependencies:

f872d4af79fe ("irqchip/meson-gpio: Convert meson_gpio_irq_controller::lock to 'raw_spinlock_t'") cc311074f681 ("irqchip/meson-gpio: support more than 8 channels gpio irq")

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From f872d4af79fe8c71ae291ce8875b477e1669a6c7 Mon Sep 17 00:00:00 2001 From: Arseniy Krasnov avkrasnov@salutedevices.com Date: Mon, 29 Jul 2024 16:18:50 +0300 Subject: [PATCH] irqchip/meson-gpio: Convert meson_gpio_irq_controller::lock to 'raw_spinlock_t'

This lock is acquired under irq_desc::lock with interrupts disabled.

When PREEMPT_RT is enabled, 'spinlock_t' becomes preemptible, which results in invalid lock acquire context;

[ BUG: Invalid wait context ] swapper/0/1 is trying to lock: ffff0000008fed30 (&ctl->lock){....}-{3:3}, at: meson_gpio_irq_update_bits0 other info that might help us debug this: context-{5:5} 3 locks held by swapper/0/1: #0: ffff0000003cd0f8 (&dev->mutex){....}-{4:4}, at: __driver_attach+0x90c #1: ffff000004714650 (&desc->request_mutex){+.+.}-{4:4}, at: __setup_irq0 #2: ffff0000047144c8 (&irq_desc_lock_class){-.-.}-{2:2}, at: __setup_irq0 stack backtrace: CPU: 1 PID: 1 Comm: swapper/0 Not tainted 6.9.9-sdkernel #1 Call trace: _raw_spin_lock_irqsave+0x60/0x88 meson_gpio_irq_update_bits+0x34/0x70 meson8_gpio_irq_set_type+0x78/0xc4 meson_gpio_irq_set_type+0x30/0x60 __irq_set_trigger+0x60/0x180 __setup_irq+0x30c/0x6e0 request_threaded_irq+0xec/0x1a4

Fixes: 215f4cc0fb20 ("irqchip/meson: Add support for gpio interrupt controller") Signed-off-by: Arseniy Krasnov avkrasnov@salutedevices.com Signed-off-by: Thomas Gleixner tglx@linutronix.de Cc: stable@vger.kernel.org Link: https://lore.kernel.org/all/20240729131850.3015508-1-avkrasnov@salutedevices...

diff --git a/drivers/irqchip/irq-meson-gpio.c b/drivers/irqchip/irq-meson-gpio.c index 27e30ce41db3..cd789fa51519 100644 --- a/drivers/irqchip/irq-meson-gpio.c +++ b/drivers/irqchip/irq-meson-gpio.c @@ -178,7 +178,7 @@ struct meson_gpio_irq_controller { void __iomem *base; u32 channel_irqs[MAX_NUM_CHANNEL]; DECLARE_BITMAP(channel_map, MAX_NUM_CHANNEL); - spinlock_t lock; + raw_spinlock_t lock; };

static void meson_gpio_irq_update_bits(struct meson_gpio_irq_controller *ctl, @@ -187,14 +187,14 @@ static void meson_gpio_irq_update_bits(struct meson_gpio_irq_controller *ctl, unsigned long flags; u32 tmp;

- spin_lock_irqsave(&ctl->lock, flags); + raw_spin_lock_irqsave(&ctl->lock, flags);

tmp = readl_relaxed(ctl->base + reg); tmp &= ~mask; tmp |= val; writel_relaxed(tmp, ctl->base + reg);

- spin_unlock_irqrestore(&ctl->lock, flags); + raw_spin_unlock_irqrestore(&ctl->lock, flags); }

static void meson_gpio_irq_init_dummy(struct meson_gpio_irq_controller *ctl) @@ -244,12 +244,12 @@ meson_gpio_irq_request_channel(struct meson_gpio_irq_controller *ctl, unsigned long flags; unsigned int idx;

- spin_lock_irqsave(&ctl->lock, flags); + raw_spin_lock_irqsave(&ctl->lock, flags);

/* Find a free channel */ idx = find_first_zero_bit(ctl->channel_map, ctl->params->nr_channels); if (idx >= ctl->params->nr_channels) { - spin_unlock_irqrestore(&ctl->lock, flags); + raw_spin_unlock_irqrestore(&ctl->lock, flags); pr_err("No channel available\n"); return -ENOSPC; } @@ -257,7 +257,7 @@ meson_gpio_irq_request_channel(struct meson_gpio_irq_controller *ctl, /* Mark the channel as used */ set_bit(idx, ctl->channel_map);

- spin_unlock_irqrestore(&ctl->lock, flags); + raw_spin_unlock_irqrestore(&ctl->lock, flags);

/* * Setup the mux of the channel to route the signal of the pad @@ -567,7 +567,7 @@ static int meson_gpio_irq_of_init(struct device_node *node, struct device_node * if (!ctl) return -ENOMEM;

- spin_lock_init(&ctl->lock); + raw_spin_lock_init(&ctl->lock);

ctl->base = of_iomap(node, 0); if (!ctl->base) {